[ 3035.085813] ata1.00: read unc at 145090280
[ 3035.089978] lba 145090280 start 9453280 end 3907015007
[ 3035.095217] sda5 auto_remap 0
[ 3035.098278] ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x0
[ 3035.104806] ata1.00: irq_stat 0x40000008
[ 3035.108809] ata1.00: failed command: READ FPDMA QUEUED
[ 3035.114047] ata1.00: cmd 60/20:00:e8:e6:a5/00:00:08:00:00/40 tag 0 ncq 16384 in
[ 3035.114049]          res 41/40:00:e8:e6:a5/f4:00:08:00:00/40 Emask 0x409 (media error) <F>
[ 3035.129912] ata1.00: status: { DRDY ERR }
[ 3035.134000] ata1.00: error: { UNC }
[ 3035.149791] ata1.00: configured for UDMA/133
[ 3035.154174] ata1: EH complete


Below is a "dmesg |grep unc":
[  349.573615] ata1.00: read unc at 143426848
[  354.826012] ata1.00: read unc at 143426848
[  360.067392] ata1.00: read unc at 143426848
[  365.143077] ata1.00: read unc at 143426848
[  370.307370] ata1.00: read unc at 143426848
[  375.482533] ata1.00: read unc at 143426848
[  380.646659] ata1.00: read unc at 143426848
[  385.810786] ata1.00: read unc at 143426848
[  390.974918] ata1.00: read unc at 143426848
[  396.139055] ata1.00: read unc at 143426848
[  401.314206] ata1.00: read unc at 143426848
[  406.478334] ata1.00: read unc at 143426848
[  411.819014] ata1.00: read unc at 143426848
[  416.983150] ata1.00: read unc at 143426848
[  422.147276] ata1.00: read unc at 143426848
[  427.322440] ata1.00: read unc at 143426848
[  432.486567] ata1.00: read unc at 143426848
[  437.738972] ata1.00: read unc at 143426848
[  442.914133] ata1.00: read unc at 143426848
[  448.078262] ata1.00: read unc at 143426848
[  453.242394] ata1.00: read unc at 143426848
[  490.207856] ata1.00: read unc at 143411424
[  495.565147] ata1.00: read unc at 143411424
[  500.811969] ata1.00: read unc at 143411424
[  506.086437] ata1.00: read unc at 143411424
[  511.250561] ata1.00: read unc at 143411424
[  516.414711] ata1.00: read unc at 143411424
[  521.667099] ata1.00: read unc at 143411424
[  526.831227] ata1.00: read unc at 143411424
[  531.995352] ata1.00: read unc at 143411424
[  537.071028] ata1.00: read unc at 143411424
[  542.235332] ata1.00: read unc at 143411424
[  547.399466] ata1.00: read unc at 143411424
[  552.651871] ata1.00: read unc at 143411424
[  557.816000] ata1.00: read unc at 143411424
[  562.980127] ata1.00: read unc at 143411424
[  568.320822] ata1.00: read unc at 143411424
[  573.396489] ata1.00: read unc at 143411424
[  578.649058] ata1.00: read unc at 143411424
[  583.901468] ata1.00: read unc at 143411424
[  589.065594] ata1.00: read unc at 143411424
[  594.229732] ata1.00: read unc at 143411424
[  630.500002] ata1.00: read unc at 143411424
[  635.575695] ata1.00: read unc at 143411424
[  640.739992] ata1.00: read unc at 143411424
[  645.815676] ata1.00: read unc at 143411424
[  650.979969] ata1.00: read unc at 143411424
[  656.144106] ata1.00: read unc at 143411424
[  661.308245] ata1.00: read unc at 143411424
[  666.472356] ata1.00: read unc at 143411424
[  671.636487] ata1.00: read unc at 143411424
[  676.888891] ata1.00: read unc at 143411424
[  682.053020] ata1.00: read unc at 143411424
[  687.217150] ata1.00: read unc at 143411424
[  692.381280] ata1.00: read unc at 143411424
[  697.633687] ata1.00: read unc at 143411424
[  702.886083] ata1.00: read unc at 143411424
[  708.050215] ata1.00: read unc at 143411424
[  713.302621] ata1.00: read unc at 143411424
[  718.555024] ata1.00: read unc at 143411424
[  723.719157] ata1.00: read unc at 143411424
[  728.971548] ata1.00: read unc at 143411424
[  734.223964] ata1.00: read unc at 143411424
[ 2532.002573] ata1.00: read unc at 143605856
[ 2537.453600] ata1.00: read unc at 143605856
[ 2542.805322] ata1.00: read unc at 143605856
[ 2547.980467] ata1.00: read unc at 143605856
[ 2552.967878] ata1.00: read unc at 143605856
[ 2558.132176] ata1.00: read unc at 143605856
[ 2563.483893] ata1.00: read unc at 143605856
[ 2568.835595] ata1.00: read unc at 143605856
[ 2574.176286] ata1.00: read unc at 143605856
[ 2596.885207] ata1.00: read unc at 144591072
[ 2601.994167] ata1.00: read unc at 144591072
[ 2607.158298] ata1.00: read unc at 144591072
[ 2612.443805] ata1.00: read unc at 144591072
[ 2617.696205] ata1.00: read unc at 144591072
[ 2622.948613] ata1.00: read unc at 144591072
[ 2628.112740] ata1.00: read unc at 144591072
[ 2633.276867] ata1.00: read unc at 144591072
[ 2638.617548] ata1.00: read unc at 144591072
[ 2643.869955] ata1.00: read unc at 144591072
[ 2649.034079] ata1.00: read unc at 144591072
[ 2654.286482] ata1.00: read unc at 144591072
[ 2659.538890] ata1.00: read unc at 144591072
[ 2664.703020] ata1.00: read unc at 144591072
[ 2669.867151] ata1.00: read unc at 144591072
[ 2675.119549] ata1.00: read unc at 144591072
[ 2680.371960] ata1.00: read unc at 144591072
[ 2685.624362] ata1.00: read unc at 144591072
[ 2690.876770] ata1.00: read unc at 144591072
[ 2696.040897] ata1.00: read unc at 144591072
[ 2701.205022] ata1.00: read unc at 144591072
[ 2725.790302] ata1.00: read unc at 145090272
[ 2731.020150] ata1.00: read unc at 145090272
[ 2736.184278] ata1.00: read unc at 145090272
[ 2741.613230] ata1.00: read unc at 145090312
[ 2746.777355] ata1.00: read unc at 145090272
[ 2752.118041] ata1.00: read unc at 145090312
[ 2757.458717] ata1.00: read unc at 145090272
[ 2762.799398] ata1.00: read unc at 145090312
[ 2767.963525] ata1.00: read unc at 145090272
[ 2773.304205] ata1.00: read unc at 145090312
[ 2778.468338] ata1.00: read unc at 145090272
[ 2783.809013] ata1.00: read unc at 145090312
[ 2788.973148] ata1.00: read unc at 145090272
[ 2794.137276] ata1.00: read unc at 145090312
[ 2799.301401] ata1.00: read unc at 145090272
[ 2804.642080] ata1.00: read unc at 145090312
[ 2809.806212] ata1.00: read unc at 145090272
[ 2815.334478] ata1.00: read unc at 145090312
[ 2820.498611] ata1.00: read unc at 145090272
[ 2826.335839] ata1.00: read unc at 145090320
[ 2831.499963] ata1.00: read unc at 145090272
[ 2836.840649] ata1.00: read unc at 145090312
[ 2842.004774] ata1.00: read unc at 145090272
[ 2847.345461] ata1.00: read unc at 145090312
[ 2852.509580] ata1.00: read unc at 145090272
[ 2858.037849] ata1.00: read unc at 145090312
[ 2863.201977] ata1.00: read unc at 145090272
[ 2868.542659] ata1.00: read unc at 145090312
[ 2873.706786] ata1.00: read unc at 145090272
[ 2879.047469] ata1.00: read unc at 145090312
[ 2884.123151] ata1.00: read unc at 145090272
[ 2889.464005] ata1.00: read unc at 145090312
[ 2894.628134] ata1.00: read unc at 145090272
[ 2899.968808] ata1.00: read unc at 145090312
[ 2905.132943] ata1.00: read unc at 145090272
[ 2910.297070] ata1.00: read unc at 145090312
[ 2915.461194] ata1.00: read unc at 145090272
[ 2920.625324] ata1.00: read unc at 145090312
[ 2925.789457] ata1.00: read unc at 145090272
[ 2931.196344] ata1.00: read unc at 145090312
[ 2936.537021] ata1.00: read unc at 145090280
[ 2941.877695] ata1.00: read unc at 145090312
[ 2947.119077] ata1.00: read unc at 145090280
[ 2952.283198] ata1.00: read unc at 145090280
[ 2957.623883] ata1.00: read unc at 145090280
[ 2962.788007] ata1.00: read unc at 145090280
[ 2967.952137] ata1.00: read unc at 145090280
[ 2973.116270] ata1.00: read unc at 145090280
[ 2978.280395] ata1.00: read unc at 145090280
[ 2983.444526] ata1.00: read unc at 145090280
[ 2988.608657] ata1.00: read unc at 145090280
[ 2993.772781] ata1.00: read unc at 145090280
[ 2998.936911] ata1.00: read unc at 145090280
[ 3004.101041] ata1.00: read unc at 145090280
[ 3009.265174] ata1.00: read unc at 145090280
[ 3014.429300] ata1.00: read unc at 145090280
[ 3019.593428] ata1.00: read unc at 145090280
[ 3024.757557] ata1.00: read unc at 145090280
[ 3029.921690] ata1.00: read unc at 145090280
[ 3035.085813] ata1.00: read unc at 145090280
[ 3040.249939] ata1.00: read unc at 145090280